Search for short term variations of zodical light and optical detection of interplanetary plasma clouds

Details Search for short term variations of zodical light and optical detection of interplanetary plasma clouds Search for short term variations of zodical light and optical detection of interplanetary plasma clouds

Jun 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...110..115r&link_type=abstract

Astronomy and Astrophysics, vol. 110, no. 1, June 1982, p. 115-120. Bundesministerium für Forschung und Technologie

Astronomy and Astrophysics

Astrophysics

33

Helios Project, Periodic Variations, Plasma Clouds, Quadrantid Meteoroids, Zodiacal Dust, Zodiacal Light, Astronomical Photometry, Electron Density (Concentration), Luminous Intensity, Planetary Orbits, Plasma Density, Solar Activity Effects, Sunspot Cycle, West Comet

Scientific paper

The zodiacal light data recorded from the Helios space probes were searched for short term variations. No variations associated with meteor streams, cometary or planetary orbits, or solar activity were found. This is strong evidence for a smooth spatial distribution of the particles causing the zodiacal light. It also is an additional indication that these particles are predominantly large compared to the wavelength of visible light, because sub-micron particles would be subject to strong disturbances by the varying interplanetary field. The only observed short term variations are caused by large plasma clouds, often originating at high heliographic latitudes, which may individually be detected by Helios at heliocentric distances much larger than those accessible to coronagraphs. The number and size of these clouds increases with solar activity, and there also appears to be a parallel increase in the general plasma density.

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